600MW机组对冲燃烧锅炉低氮燃烧改造及运行调整  

Low NOx burner retrofit and operation adjustment of 600 MW opposed wall firing boiler

作　　者：应明良[1] 戴成峰[2] 胡伟锋[2] 徐良[2] 屠小宝[2] 

机构地区：[1]浙江省电力试验研究院,浙江杭州310014 [2]国电浙江北仑第一发电有限公司,浙江宁波315800

出　　处：《中国电力》2011年第4期55-58,共4页Electric Power

摘　　要：为解决600 MW火电机组对冲燃烧锅炉NOx排放质量浓度过高的问题,进行了低氮燃烧改造。通过低氮燃烧器更换,合理布置燃尽风喷嘴,采用全炉膛分级燃烧技术,使NOx排放质量浓度降低至300 mg/m3左右,达到了降低NOx排放的效果,同时锅炉飞灰含碳质量分数没有明显的变化。通过部分低温过热器置换为省煤器,降低了过热器减温水流量,同时空气预热器进口烟气温度下降,锅炉排烟温度也会随之下降,有利于提高锅炉热效率。部分低温过热器置换后省煤器出口水温提高,但还有一定的欠饱和温差,距汽化仍有一定的安全裕度。For the high NOx discharge density of 600 MW opposed wall firing boiler, the retrofitting of combustors with low NOx. was carried on. By replacing low NOx burner, arranging OFA appropriately, and adopting staged-air furnace combustion technology, the NOx discharge density was decreased to 300 mg/m^3. The unburned carbon mass fraction in fly ash was not changed greatly. By replacing parts of the low-temperature superheater with the economizer, the desuperheating water flow of superheater was reduced, the gas temperature in air preheater outlet was decreased and the exhaust gas temperature of boiler was decreased. All of these are good for improving the boiler efficiency. After the replacing of parts of the low-temperature superheater with the economizer, the water temperature of economizer outlet was increased. But the under-saturation temperature difference and the safety margin still exist.

关 键 词：对冲燃烧:低氮燃烧改造 空气分级 受热面置换 运行调整 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]